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MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS

Chapter 5: Codan Radio System Testing

Page 48

Measure the Modulation Fidelity of the transmitter as shown in Figure 5-35. The transmitter should not
read more than 5% Modulation Fidelity. If the Modulation Fidelity is more than 5%, the transmitter will
need to be returned to the factory for service. The high alarm point is set at 5%.

Figure 5-35: Transmitter Modulation Fidelity Measurement

Enter the C4FM Modulation Fidelity reading on the MT-4E Test Sheet.

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Содержание MT-4E

Страница 1: ...www codancomms com MT 4E Analog and P25 Digital Radio Systems MAINTENANCE GUIDE...

Страница 2: ......

Страница 3: ...MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS MAINTENANCE GUIDE Page i Codan MT 4E Analog and P25 Digital Radio Systems Maintenance Guide...

Страница 4: ...N CANADA Document Number Revision Revision Date MG 001 6 0 0 September 2013 Documentation uses a three level revision system Each element of the revision number signi es the scope of change as describ...

Страница 5: ...mobile data applications Our self servicing customers range from Forestry and National Park services through Police and Fire departments and on to Utility and Transportation groups Our products have b...

Страница 6: ...con guring and testing Codan MT 4R D radios using an IFR 2975 Service Monitor by Aero ex TN950 is intended to be used with IFR 2975 Setup les that can be loaded into the Service Monitor TN950 and Set...

Страница 7: ...s 3 Carrier Levels 3 Chapter 2 Installation 5 Installation of Codan Subracks 5 Chapter 3 Test Equipment and Spares 9 Recommended Test Equipment 9 Recommended Spares 10 Recommended Maintenance Items 11...

Страница 8: ...Testing 23 Receiver Digital Testing 28 Receiver Bit Error Rate Testing 30 Receiver RF Preselector Alignment and Tuning 32 Receiver Reference Oscillator Adjustment 34 Transmitter Testing 37 Transmitte...

Страница 9: ...h performance base station The total system is designed to provide dependable low maintenance performance and great exibility for expansion and servicing The MT 4E series of radio and control modules...

Страница 10: ...hould not be removed or replaced using an ordinary soldering iron Removal and replacement of surface mount components should be performed only with speci cally designed surface mount rework and repair...

Страница 11: ...s 6 928 Vpp 10 dBm 600 ohms 0 975 Vrms 2 758 Vpp 2 dBm 0 775 Vrms 2 191 Vpp 0 dBm 0 388 Vrms 1 098 Vpp 6 dBm 0 308 Vrms 0 872 Vpp 8 dBm 0 245 Vrms 0 692 Vpp 10 dBm 0 098 Vrms 0 276 Vpp 18 dBm 0 077 Vr...

Страница 12: ...MAINTENANCE GUIDE MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS Chapter 1 Codan Radio Maintenance Page 4 This Page Intentionally Left Blank...

Страница 13: ...stalled Each Codan subrack requires 5 1 4 height 3 RU and 13 5 maximum depth clearances 2 Install the subrack unit s in the 19 rack using four 10 x 3 4 screws as shown in Figure 2 1 Eight screw holes...

Страница 14: ...de rail slots if not already done When installing modules ensure the quick release fasteners on the top and the bottom of the modules are in the unlocked slot should be horizontal position before inse...

Страница 15: ...108 A for 13 8 Vdc DSP 223 or JU108 B for Rx A COR IP 223 The plug in screw connectors on the A PNL AUX96 3 can be removed to allow for easy connection of the wires For some applications a cable not a...

Страница 16: ...MAINTENANCE GUIDE MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS Chapter 2 Installation Page 8 This Page Intentionally Left Blank...

Страница 17: ...Monitor Marconi Instruments 2965A Analog Aero ex IFR 1200 Super S Aero ex IFR COM 120 Communications Service Monitor Aero ex IFR 2975 P25 Digital and Analog Aero ex IFR 3920 Aero ex IFR 3500 Aero ex...

Страница 18: ...014 01 with main power switch SM 3 H0 R1N 00 with single antenna relay SM 3 H0 R2N 00 with dual antenna relays Control Card CI RC 4L Repeater Control Card CI BC 4E Base Control Card CI RC 4M Multiple...

Страница 19: ...hop EC 48RK 1 22 48 pin Extender Kit with cable EC 96K 1 22 96 pin Extender Kit with cable Items included in the MT 4 Tool Kit include 5192 WJ01BJ01 SMB to BNC Jack Adapter 7910 WP0WP012 SMB to SMB Ca...

Страница 20: ...MAINTENANCE GUIDE MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS Chapter 3 Test Equipment and Spares Page 12 This Page Intentionally Left Blank...

Страница 21: ...general maintenance of the site Radio sites that are not remote can also bene t greatly from a site survey A site survey is a valuable tool in the preventative maintenance of the radio site Documenti...

Страница 22: ...04 Tool Kit Optional Items Paper pens and pencils for documenting Soldering Iron solder and de soldering tool Portable radio Survival gear food and drink Camera for photographing site condition Keys f...

Страница 23: ...the radio site is entered an interior survey of the site should be conducted Check the interior of the building including the oor for water leaks animal entry or other damage Check the condition of t...

Страница 24: ...nd antenna system to ensure it is all connected properly and that the RF connectors are all rmly in place on all equipment Check that the power supply is turned on connected and operational Check that...

Страница 25: ...ocedure Codan manufactured products are warranted against defective materials and workmanship This warranty does not extend to damage due to misuse neglect accident improper con guration or installati...

Страница 26: ...ed and copied onto a oppy disk or transferred onto the network If a Codan directory already exists on your IFR 2975 for MT 4R D testing rename that directory or it will be overwrittwen by the MT 4E Co...

Страница 27: ...Control Card remove the control card from the rack for the individual receiver and transmitter tests unless otherwise noted Adapters Cables and Extender Cards Various adapters cables and extender card...

Страница 28: ...her When the MT 4E receiver and transmitter channel and bank select lines are connected together in parallel turning the MT 4E receiver or transmitter front panel switch to the OFF position will cause...

Страница 29: ...on with clip on type clips Recommended Test Points are Audio Control Card and Base Control Card Extender Card pins EC 96D1 and EC 96K 1 22 Auxiliary 1 Audio Output B11 and A11 Auxiliary 2 Audio Output...

Страница 30: ...Bm carrier signal into the Receiver and record the RSSI Voltage on the MT 4E Test Sheet Enter the Date Firmware Versions and Serial numbers of the Receivers and Transmitters on the MT 4E Test Sheet Th...

Страница 31: ...olume up until the 1 KHz tone is audible In the Jumper Settings area of the Service section on the RSS ensure that the Subtones on audio path selection is set to Don t pass as shown in Figure 5 4 The...

Страница 32: ...age 24 Audio Distortion To check receiver distortion inject 70 dBm RF carrier level into the receiver and measure the distortion on the meter as shown in Figure 5 5 The High Alarm is set to 2 0 Figure...

Страница 33: ...rtion or reference sensitivity measurements are not within Codan published speci cations the RF Preselector may need re alignment Refer to the Receiver RF Preselector Alignment and Tuning section Sque...

Страница 34: ...used Inject 70 dBm RF carrier level into the receiver Figure 5 7 Receiver Analog Audio Testing In the Audio Levels area of the Service section on the RSS adjust the Rx Balanced Audio Output level adj...

Страница 35: ...is used Auxiliary 1 audio output is available on pins B11 and A11 and Auxiliary 2 audio output is available on pins C1 and C3 for the AC 3E Control Card and pins C2 and C4 for the CI BC 4E Base Contr...

Страница 36: ...he 1011 test pattern VOL SYSTEM REGULATOR METER MADE IN CANADA ON OFF SPKR INT EXT EXT SPKR OFF POWER ON 2 1 5 4 3 6 7 8 11 10 9 FUNCTION 12 RECEIVER NORM SQ DISABLE OFF CNTL BUS A D RF N I REF IN USB...

Страница 37: ...Radio System Testing Page 29 Inject the correct NAC and TGID if programmed and ensure that the receiver is operating as shown in Figure 5 11 There are no speci c measurements to make on this test just...

Страница 38: ...pattern will not operate correctly for this test as shown in Figure 5 13 Figure 5 13 Receiver Bit Error Rate Test Injection VOL SYSTEM REGULATOR METER MADE IN CANADA ON OFF SPKR INT EXT EXT SPKR OFF P...

Страница 39: ...st You should get 0 BER at the 70 dBm default RF carrier level Monitor the BER reading while slowly reducing the RF carrier level as shown in Figure 5 14 The 5 BER point should be at an RF carrier lev...

Страница 40: ...nternal in the receiver that terminates in an SMB connector The SMB plugs into J3 on the Receiver Mainboard Disconnect the SMB cable from J3 and use the SMB BNC adapter to connect this point to the AN...

Страница 41: ...t hand side of the screen click on the Run button The lter waveform should appear as shown in Figure 5 17 Click on Options then Con gure Markers to add optional markers to the spectrum analyzer if des...

Страница 42: ...oint to the ANT input on the IFR 2975 as shown in Figures 5 19 VHF and UHF 400 MHz Receiver and 5 20 UHF 700 800 900 MHz Receiver Figure 5 19 VHF and UHF 400 MHz Receiver Reference Oscillator Connecti...

Страница 43: ...Page 35 Figure 5 20 UHF 700 800 900 MHz Receiver Reference Oscillator Connection On the IFR 2975 recall Codan setup 5 Rx_Ref from your internal drive as shown in Figure 5 21 Figure 5 21 Receiver Refe...

Страница 44: ...erates this frequency out of the Synthesizer into the IFR 2975 Monitor the RF Error window on the IFR 2975 To change the reference frequency adjust the softpot slider in the RSS as shown in Figure 5 2...

Страница 45: ...RSS FGEN1 is con gured to inject a 1 0 KHz tone at 8 0 dBm 0 308 Vrms into the transmitter balanced input TRANSMITTER CNTL BUS MIC RF OUT A D ANALOG DIGITAL NORM OFF KEY TX MICMODE REF IN USB FREQUENC...

Страница 46: ...g Page 38 Audio Distortion The distortion meter will read demodulated audio and give you a transmitter distortion reading as shown in Figure 5 24 The High Alarm is set to 3 0 Figure 5 24 Transmitter D...

Страница 47: ...as shown in Figure 5 25 to change the RF output power The High Alarm is set at 8 5 Watts and the Low Alarm is set at 0 5 Watts Transmitter RF power output will vary slightly with the 10 17 Vdc input F...

Страница 48: ...Auxiliary Balanced Input is only available on the AC 3E Control Card or CI BC 4E Base Control Card Change the Audio Filter below DEMOD from BANDPASS to 15 KHz LP as shown in Figure 5 26 for a more ac...

Страница 49: ...ansmit a maximum deviation at an audio frequency of approximately 1300 Hz Enter the Transmitter Maximum Deviation Level reading on the MT 4E Test Sheet To adjust the auxiliary balanced audio input plu...

Страница 50: ...internal drive Enter the correct RF frequency on the IFR 2975 set the MIC MODE switch on the front panel of the transmitter to Analog and ip the other switch to KEY TX or set the switch to NORM and ke...

Страница 51: ...n gured to inject a 100 Hz tone at 18 0 dBm 0 098 Vrms or 0 277 Vpp into the Tx Subtone input as shown in Figure 5 29 If the internal programming is used to generate the CTCSS tone FGEN1 is not used a...

Страница 52: ...button and adjust the Narrow and or Wide Internal and or External Subtone Deviation level adjustment as shown in Figure 5 30 until a deviation of 0 35 KHz narrowband or 0 5 KHz wideband is measured o...

Страница 53: ...o NORM and key the transmitter through the RSS TRANSMITTER CNTL BUS MIC RF OUT A D ANALOG DIGITAL NORM OFF KEY TX MICMODE REF IN USB FREQUENCY MHz MADE IN CANADA MODEL CODE Tx Balanced Audio Input to...

Страница 54: ...herent in all P25 radio systems Optionally a microphone can be connected to the front panel of the transmitter and the tester can speak into the microphone and listen to the demodulated audio on the I...

Страница 55: ...the transmitter frequency is in the frequency box In the Select Pattern window select C4FM Modulation Fidelity Click on the Key Tx button as shown in Figure 5 34 and the transmitter will begin genera...

Страница 56: ...as shown in Figure 5 35 The transmitter should not read more than 5 Modulation Fidelity If the Modulation Fidelity is more than 5 the transmitter will need to be returned to the factory for service Th...

Страница 57: ...this RF frequency into the IFR 2975 Click on the Key Tx button and the transmitter will generate the reference frequency out of the RF output into the IFR 2975 Monitor the RF Error window on the IFR...

Страница 58: ...F error is as close to 0 Hz as possible as shown in Figure 5 38 Click on the Program button to program in the new Reference Oscillator softpot value The high and low alarms are turned o Figure 5 38 Tr...

Страница 59: ...r Digital or Analog this test does not make use of the front panel switch TRANSMITTER CNTL BUS MIC RF OUT A D ANALOG DIGITAL NORM OFF KEY TX MICMODE REF IN USB FREQUENCY MHz MADE IN CANADA MODEL CODE...

Страница 60: ...directly together using the RJ45 cables Figure 5 40 System Analog Duplex Measurement Demodulated Audio Frequency Check the COUNT meter on the meter panel The demodulated audio should read the same as...

Страница 61: ...be adjusted In the receiver or transmitter RSS enter the Service section and click on LVDS Level A default value of 100 on the softpot slider should be close to matching receiver and transmitter devi...

Страница 62: ...gital or Analog this test does not make use of the front panel switch TRANSMITTER CNTL BUS MIC RF OUT A D ANALOG DIGITAL NORM OFF KEY TX MICMODE REF IN USB FREQUENCY MHz MADE IN CANADA MODEL CODE RECE...

Страница 63: ...tem Testing Page 55 Ensure that the receiver and transmitter are connected to the repeater controller via the RJ45 cables on the front panel In some systems the receiver and transmitter may be connect...

Страница 64: ...GID and Unit ID programmed into the transmitter via the RSS are only transmitted when keying the transmitter in a non repeater mode see the Transmitter Digital Testing In repeater mode the system tran...

Страница 65: ...additional radio system tests can be performed on the Codan MT 4E radio system at the radio site with the full radio system In this chapter testing of the radio system is typically done as an entire...

Страница 66: ...CNTL BUS MIC RF OUT A D ANALOG DIGITAL NORM OFF KEY TX MICMODE REF IN USB FREQUENCY MHz MADE IN CANADA MODEL CODE RECEIVER NORM SQ DISABLE OFF CNTL BUS A D RF N I REF IN USB FREQUENCY MHz MADE IN CAN...

Страница 67: ...r and power ampli er or between the transmitter or power ampli er and duplexer to measure the VSWR at these locations Figure 6 2 Transmitter VSWR Testing TRANSMITTER CNTL BUS MIC RF OUT A D ANALOG DIG...

Страница 68: ...KEY TX and check the SINAD meter for any noticeable drop in sensitivity If the sensitivity does drop increase the RF carrier level on the IFR 2975 until the 12 dB SINAD point is reached Receiver desen...

Страница 69: ...ved This is the received RF carrier level on that link Figure 6 4 RF Carrier Level on Link Test Portable Repeater Site B Repeater Site A LINK ANTENNA Switched Attenuator RF Carrier Signal between Site...

Страница 70: ...of the analyzer causing erroneous spurs to be shown in the spectrum Look at the spectrum and ensure there are no large spurs being generated by the radio system Figure 6 5 Spurious Signals over the Ai...

Страница 71: ...Exterior Site Survey Building Condition Site Photographs Antennas and structure RF cables and connectors Leased lines and power cables Lightning protection Obstructions Interior Site Survey Building...

Страница 72: ...uipment Duplexer Duplexer Combiner Mulitcoupler Power Supply Cabinet Rack Antenna Antenna VHF ___ UHF ___ AC DC ___ DC DC ___ VHF ___ UHF ___ Additional Information 96 pin Auxiliary Connector on back...

Страница 73: ...andby Current Draw Transmit Current Draw No parameter typically squelch unsquelch points are centered around 12 dB SINAD point with 6 dB of hysteresis 3 0 CTCSS Encode Tone Deviation 350 Hz 12 5 KHz o...

Страница 74: ...MAINTENANCE GUIDE MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS Chapter 7 Blank Worksheets Page 66 This Page Intentionally Left Blank...

Страница 75: ......

Страница 76: ...C Canada V8V 1P8 www codancomms com LMRsales codancomms com Toll Free Canada and USA Phone 1 800 664 4066 Fax 1 877 750 0004 International Phone 250 382 8268 Fax 250 382 6139 2013 Codan Limited All Ri...

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